What diagnostic tool can be used to measure the temperature drop across an evaporator?

The measurement of temperature drop across an evaporator is crucial in assessing the efficiency of a refrigeration system. A thermometer or digital temperature probe is specifically designed to measure temperature accurately at two points, which is necessary for determining the temperature differential between the entering and leaving air or refrigerant in the evaporator.

Using a thermometer or digital temperature probe allows for precise readings that are essential for calculating performance metrics such as superheat or system efficiency. This tool also facilitates the monitoring of the system's condition, helping technicians to identify potential issues early on.

In contrast, a humidity meter is used to measure moisture content in the air, which is not relevant for determining temperature differences across an evaporator. A pressure gauge measures the pressure of the refrigerant within the system, but it does not provide any information about temperature. An infrared camera, while useful for visualizing temperature differences on surfaces, does not provide the direct reading required to analyze the temperature drop in the context of refrigeration performance. Thus, the thermometer or digital temperature probe is the appropriate tool for this diagnostic task.